Metal-organic framework (MOF)/reduced graphene oxide (rGO) composite for high performance CO sensor

•synthesis of NiO- MOF and its composite with thermally reduced GO has synthesized by hydrothermal method.•Synthesized materials characterized with XRD, FTIR, Raman spectroscopy, UV–Visible spectroscopy, BET surface area method, AFM and I-V.•The chemirestive sensor was fabricated by shadow mask technique on copper coated electrodes and CO gas was tested in the chemirestive modality.•Synthesized composite detected CO well below OSHA PEL level with good response time (30 sec) and recovery time (70 sec).